Phocal

It is no different.  All any of the adapters do is set the lens at the proper distance from the sensor.  Some have pass through electrical contacts to give full control of the lens, some are just ...

Correct.  What the OP is talking about is due to the large buffer and the faster write speed to cards.

It is also a 300mm lens and not a 500mm lens.  Big difference with respect to price and the Olympus 300/4 is the most expensive 300/4 on the market.

This lens is to little to late.

I have always used 3rd party batteries and despite them saying they have more capacity than the Olympus batteries they all last less time.  I have yet to find a 3rd party battery no matter what ...

You have two options (1) Upgrade to an EM1 (2) Buy more BLS50 batteries I guess there is a 3rd option, switch systems............which I don't think you will ...

Trade up for an EM1 is your only option.  There are no 3rd party batteries that I am aware of that have a higher capacity.

Actually it really isn't that difficult.  I do it all the time when comparing lenses.

he is referring to the 4/3’s 300/2.8 aka the Big Tuna

Olympus MZ 300mm f4.0 IS Pro

Keep in mind that the micro focus adjustment only applies to CAF and in this case it will make no difference.

Honestly, in your example I find the 40-150 unacceptable.  I would return the MC-20 and use the 75-300.  The 75-300 is not a bad lens, especially if used within its limits. P!ssed that I wasn't ...

I guess I am seeing a different photograph than everyone else because like your bluejay photograph this one has zero detail in it.

Is this a large crop that you upsized?  I ask because there is zero detail in the photograph but the image is over 6000px long.

I have been in -30 to -40 F with my X and it seems to last longer than my original EM1's in the cold.

Panasonic is leaving m4/3 to concentrate on full frame.

Sony